Concrete building construction.



crete.

' through the samel UNITED STATES PATENT OFFICE.

ALBERT S. REAVIS, OF WASI-IINGTO\ DISTRICT OF COLUMBIA.

CONCRETE BUILDING CONSTRUCTION.

Specificationof Letters Patent.

Patented Feb. 12, 1907.

rl'iplication filed October-29.1906. Serial No. 341,110.

This invention relates to concrete building construction, the object ofthe invention being to provide a bar of novel and'effective constructionadapted to be used as a core to be embedded in the concrete, which barwhen the concrete has hardenedaround the same will prevent slippage cfthe concrete.

lengthwise thereof should said concrete for any reason become loose uponthe bar from jar or vibration or other cause.

With the above andother objects in view the invention consists in thenovel construction, combination, and arrangement of parts herein fullydescribed, illustrated,and claimed.

In the accompanying drawings, Figure 1 is a longitudinal sectional viewof the bar of this invention shown embedded in con- Fig. 2 is anenlarged plan view of a portion of the bar. Fig. 3 is a cross-sectionFig. 4 is also a cross-section showing a slight modification in the formof the bar. Fig. 5 is a plan view similar to Fig. 2, showing a modifiedarrangementof ribs or transverse corrugations.

The bar contemplated in this invention embodies a solid'body 1, which ispreferably equilateral or square in cross-section,

shown in Figs. 3 and 4, and provided with longitudinal ribs 2, whichunder the preferred embodiment of v the invention are located at andextend along the corners of the body. These longitudinal ribs 2 may i beeither parallel-sided, as shown in Fig. 3,

with the opposite sides extending obliquely with relation'to theoppositeflat sides of the body 1, such oblique and parallel-sided facesbeing designated at 3, or said ribsma be made heavier, as shown in Fig.4, by ma ing each 'of said substantially square in cross-section, the.inner corners of the ribs merging into the corres onding outer cornersof the s uare body oFthe bar.

Under; eit er arrangement of ribs just dejscri-bed the bar is providedwith channels 4,

extending lengthwise of eacl" o'i its sides, saidv channels beingdefined .nd bounded ,at'opposite sides by the ribs 2. Each of thechannels 4 is interrupted by any desired number oi ribs or corrugations5, which extend. transversely across thechannels, and

\shown in Figs. 1 and 2, or said ribs may be located at greater distanceapart, as indicated in Fig. 5. Alsosaid Ill)S may be quite wide, asshown in Figs. '1 and 2, or narrow and thin, as indicated in Fig. 5. Thecrossribs on onesidc may either be arranged in transversealinement withthose on the remaining sides, as in Fig. 1, or they may be staggered, asindicated in Fig. 5.

The longitudinal ribs 2 obtain a firm hold upon the concrete and preventrelative turning between the concrete and the bar, while the cross-ribsprevent endwise slipping between the same elements. Ordinarily thesebars are made of steel; but of course any desired material may be usedin their manufacture.

I claim 1. A bar adapted to be used as a core to be embedded inconcrete, comprising a solid ilat-sided body angular in cross-section,;aseries of straight ribs extending lengthwise of the bod along the anglesor corners thereof, and short transverse ribs extending at right anglesto the longitudinal ribs, said short ribs crossing the flat sides of thebody and interrupting the channels formed by the longitudinal ribs.

2. A bar adapted to beused as a core to be embedded in concrete,comprising a square body, ribs extending lengthwise oi the body andlocated at the corners of the body, and cross-ribs extending at rightangles to the longitudinal ribs crossing and interrupting the channelsleft between the longitudinal ribs, said cross-ribs projecting outwardbeyond the outer ends of the longitudinal ribs. to 5 ALBERT S. REAVIS.

Witnesses:

A. M. PARKINS, v Rnxronn M. SMI'rl-I.

